/* Child process for syn-read test.
   Writes into part of a test file.  Other processes will be
   writing into other parts at the same time. */

#include <random.h>
#include <stdlib.h>
#include <syscall.h>
#include "tests/lib.h"
#include "tests/filesys/base/syn-write.h"

char buf[BUF_SIZE];

int main(int argc, char *argv[])
{
    int child_idx;
    int fd;

    quiet = true;

    CHECK(argc == 2, "argc must be 2, actually %d", argc);
    child_idx = atoi(argv[1]);

    random_init(0);
    random_bytes(buf, sizeof buf);

    CHECK((fd = open(file_name)) > 1, "open \"%s\"", file_name);
    seek(fd, CHUNK_SIZE * child_idx);
    CHECK(write(fd, buf + CHUNK_SIZE * child_idx, CHUNK_SIZE) > 0,
          "write \"%s\"", file_name);
    msg("close \"%s\"", file_name);
    close(fd);

    return child_idx;
}
